Roasting-furnace.



A. R. WILFLEY.

ROASTING FURNAGE.

APPLICATION FILED FEB.19,1907.

separation.

These Water jackets reduce the heat of the 'UNITED sTATnsrArENT OFFICE.Y

ARTHUR R. WILFLEY, OF DENVER, COLORADO, ASSIGNOR OF SEEP, OF OIL CITY,

PENNSYLVANIA.

ROASTING-FURNACE.

Specification of Letters Patent.

Patented Nov. 9, 1909.

Application tiled February 19, 1907. Serial No. 358,169.

To all whom it may concer/n,.-

Be it known that I, ARTHUR It. IVILFLEY, a citizen of the United States,residing at the city and count-y of Denver and State of Colorado, haveinvented certain new and useful Improvements in Roasting-Furnaces;A andI do declare the following to be a full, clear. and exact description ofthe invention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the figures of reference marked thereon,which form a part of this specification.

My invention relates to improvements in roasting furnaces moreespecially adapted for producing a. magnetic roast or a roast wherebythe ore is prepared for magnetic In order to obtain satisfactory resultsin the magnetic separation of ores, it is exceedingly important toprevent the overroasting of the ores, or the overheating thereof due tothe combust-ible elements contained in the ores which results in partialfusion, causing the ore particles to cling together thus retarding theirseparation. In my previous application No. 338,725, filed Oct. 15th,1906, allowed Dec. 13th, 1906, provision is made for subjecting the oreparticles while falling to sufficient heat for roasting purposes andcooling the said particles while in the disseminated state, sufficientlyto overcome the clinging tendency. In my present application I proposeto provide mechanism, to prevent the overheating of the ores Whiletraveling en. masse through the roasting chamber or in suitableproximity thereto while traveling on the hearth or other support. In thedrawing one form of construction suitable for carrying out thisprinciple is illustrated, namely a shaking hearth provided with waterjackets at sultable intervals, over which the ore travels whilesubjected to the roasting temperature.

ore and are so arranged as to prevent overheating and consequentclinging which latter condition as heretofore indicated, interferes withmagnetic separation. It must be understood,'however, that the inventionis` not limited to the special construction shown j as I am aware thatother forms may be emi the 1nvention.

V Having briefly outlined my improvedconstruction I will proceed todescribe the same in detail referen being made to the accompanyingdrawing in which is illustrated an embodiment thereof.

In this drawing, Figure 1 is a vertical longitudinal section takenthrough a roasting furnace equipped with my improvements. Fig. 2 is across section taken on the line 2 2, Fig. 1. Fig. .3 is a horizontalsection taken through the walls of the furnace lookingdownwardly uponthe hearth which is shown in plan view.

The same reference characters indicate the same parts in all the views.

Let'` the numeral 5 designate a furnace having a ire box 6; an ash pit7; a bridge wall 8; a roasting chamber 9; and a stack 10. lVithin theroasting chamber is mounted a hearth 11 occupying a position downwardlyinclined from its head or right hand extremity toward the foot or tailthereof, the inclination being sufficient to cause the ore to traveldownwardly on the hearth, under the influence of the vibratory movementor shaking action imparted bv a shaft 12 provided with eccentrics 13Working in straps l1 which are connected with the head or upperextremity of the hearth by a pitman 15.

As shown in the drawing there are two pitmen, respectively connectedwith the eccentric straps engaging disks 13 on the said shaft. Thepitmen are connected with the head of the hearth by attaching them to atransverse rod 16, Whlch rod passes through head extensions 17- of thehearth. This hearth as sh'own in the drawing is composed of a number ofwater jackets 18 disposed at suitable intervals, and alternating withsolid sections or parts 19. The relative areas of the water jackets tothe plain or solid portions of the hearth, may be regulated at will. Itis desirable, however, to subject the ore to the cooling action of thejackets as it is traveling through the roasting chamber, whereby the oremay be tempered to prevent overheating and the partial fusion incidentalthereto resulting in giving the vore particles a clinging tendency.

As shown in the drawing the hearth is supported upon rollers 20 arrangedunder- ONE-HALF To JOSEPH p ...ses

5 neath the hearth and whose extremities are Y temperature at the properlimit regardless of the temperature of the roasting chamber.

journaled in theopposite sides of the furnace walls. I *lach-,water`jacket is provided with an in'let pipey 21 at one extremity and anoutlet pipe 22 at the other extremity.

Referring to Fig. 1 the pipes disclosed therein may. be considered theoutlet pipes 22 which communicate with a conduit 23 for carryin olf thewater. `This conduit is provided with a valve 24, for regulating the jcirculation of the water through the jackets.

longitudinal direction, or alongitudinal vibration will be imparted' tolthe hearth, of sufficient lrapidity to cause the ore to traveldownwardly over the hearth Vas it vpasses through theroasting chamber.Asthe orer travels from the head l of the hearth, toward the bridge wallofthe frebox, the natural tendency would be, for the temperature of theore to increase; and it would be very difficult to revent overheating.the ore,

Vwithout the mterposition of a cooling medium, particularly in the caseof heavy suliid ores, in, which the percentage of sulfur` is sogreatthat after combustion is started,

the ore supplies its own fuel and in consuming this `fuel thetemperature of the ore would be far too great for magnetic roasting,since partial fusion would result causing the ore particles whiletraveling through the roasting chambeijen messe, to cling togetherwhereby magnetic separation is retarded or prevented. However, by virtueof myl improvements, no accuracy is required in the regulation of theheat, since the water jackets serve to maintain the As shown in thedrawing the ore as' it leaves the lower extremity of the hearth,y

falls into a trough or casing 28 carrying a screw conveyer 27, wherebythe ore after it leaves the hearth may be transferred to any desiredlocation.

In order to maintain the ore upon the hearth as it travels downwardlythereover, it should be provided with longitudinally disposed, upwardlyprojecting strips or flanges, to prevent the materiall from travelingover the side edges of the hearth during its downward movement.

Having thus described my invention, what 'I claim is: j v Y j l1., `=Aroasting -furnacecomprising a roasting chamber, and means for causingthe ore' to travel therethroughen masse, and means equipped with aflexible inlet and outlet located at different intervals for cooling theore while so traveling through the said chamber to prevent over-heating.

2. In an ore roasting apparatus, the com- 'zov bination with a roastingchamber, of means A located therein for causin the ore to travel enmasse in the said c amber, the said means being provided with a numberof independent cooling media, each rovided with a. separate inlet andoutlet pipe, over which the-ore must passwith which it is brought incontact during theroasting operation. i 1 1 3. In a roastin furnace, thecombination ,with a roastingc amber, of means movably mounted forcausing the ore to travel en masse therein, andv a number of coolingjackets located at suitable intervalsin the said chamber and each'ysupplied with a separate inlet and outlet means and the said jacketsplaced in suitable proximity to the traveling ore to preventover-heating, substantially as described. i

4. The combination with a-roasting chamber, of a hearth. movably mountedtherein and carrying cooling media located at different intervals andeach provided with a separate inlet and outlet pipe and means forimparting a shaking movement to the hearth to cause the materialto'travel thereover.

5. A roasting furnace comprising a roasting chamber through which theore is adapted to travel, and a number ofindependent members, eachhaving a `separate inlet and outlet means, for subjecting the ore whiletraveling through the furnace to a cooling influence durin .the entireperiod of the roasting operatlon to prevent over-heating and theconsequent clinging of the ore particles. i v

6. A roasting furnace comprising a roasting chamber through which theore is adapted to travel, and a number of independent water jackets eachhaving a separate inlet and outlet pipe, located within the furnace forcooling the ore simultaneously with the performance of the roastingfunction, to prevent the over-heating of the ore particles and theirconsequent cllnging, substantially as described. A

In testimony whereof I affix my signature in presence of two witnesses.l

- ARTHUR R. WILFLEY.

Witnesses: l

UDENA NELSON,

A. J. OBRIEN.

